Halloween decorations are seen in the window of a business on Mission St. in the Excelsior District of San Francisco Thursday, October 31, 2013.

Halloween decorations are seen in the window of a business on Mission St. in the Excelsior District of San Francisco Thursday, October 31, 2013.

Photo: Michael Short, The Chronicle

Halloween decorations are seen in the window of a business on... Photo-5400306.73197 - SFGate

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Volunteer Brie Grillo-Hill, right, paints the face of student Andrea Fernandez, 5, just before the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, 2013. less

Volunteer Brie Grillo-Hill, right, paints the face of student Andrea Fernandez, 5, just before the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, ... more

Nona Taylor, 4, hands out organic apples to students as they march in the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, 2013. Nona was volunteering with her mother to hand out goodies to the students. less

Nona Taylor, 4, hands out organic apples to students as they march in the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, 2013. Nona was ... more

Photo: Judy Walgren, SFC

Nona Taylor, 4, hands out organic apples to students as they march... Photo-5395468.73197 - SFGate

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Dallas Wisehaupt works his son Otis Tripp Wisehaupt's, 6, hair just before the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, 2013. Otis, a first grader, went as a tornado. less

Dallas Wisehaupt works his son Otis Tripp Wisehaupt's, 6, hair just before the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, 2013. Otis, a first ... more

Second-grader Fiona Nickleson, 7, puts her vampire cape around her shoulder as she prepares for the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, 2013. less

Second-grader Fiona Nickleson, 7, puts her vampire cape around her shoulder as she prepares for the annual halloween parade at Francis Scott Key Elementary School in San Francisco, Calif., Thursday, October 31, ... more